Boring tool



Apri12es,193z1.A R T ROYE 2,115,319

BORING TOOL Filed Julyv 25, 1956 www matted Apr. ze, 193s t y 2,115,319

UNITED YSTATES PATENT OFFICE Y A i ausm' 't 1 y t y Bonino Toor. n intima rr. non, Hmm; rex., assigner' to Gray Tool Company,- Houston, Tex., a ion 'Application July'zs, 193s, ser-nim. 92,119 1 claim. (ci '1v-ss) t My invention relates to boring tools lfor use -in posite endof the body I has a shoulder I0 which machine tool operations. serves as a bearing for one end of a compression The device is particularly designed for forming spring I I, which is fitted about thestem 1 ofthe or boring tapered holes in tubular members. vmandrel and bears at its other end against the 5 1t is an object of the invention to provide a end of the chamberland holds the mandrel re- '5 vslfrong'and efllcient tool fortapping a tapered hole `siliently forward, thus tending to hold the shoul-l in a `tubularmeinber such as a 'tool joint, couder l in contact with thenut 9. l v

p ling or the like. and to so control the cutting `4 lOn one side of the mandrel is formedga longimember that the taper will be uniform and preetudinal groove or channel I2,. 'which tapers in` cise. l V I l depth in either direction butI` have shown it asm It is a further object to'provide a tool v"of the tapered from the ou'r end I3. inwardly along the character stated which will hold the cutting bit iace of the mandrel to a point closely adjacent the in stable position axially of thework so that no inner end of the body 5 of the mandrel. At that variation inl the cutting performed' by the tool point a shoulder Il on the mandrelrforms the will occur. 'f r end of said groove.4 `Where the groove isgformed 15 Itis an object of the invention to provide a in the body 5 of the mandrel theglOOVe iSlmderboring tool which willl properly prepare a tapered 'cut at I5 to infcrllt with cutter block and to form hole to receive a tapered tap. such as is used to a mortise or dovetailed groove indicated clearly in cut oil countryV threads.' By means of tapers Fig. 3, in which the inner end of4 thecuttersupwithin the housing of the tool a single cutter bit is porting block I6 may move.y The wall of the nous-"20` fed at a xed rateV and taper into` the work. By ing adjacent the slot I5 is formed with va removmeans of Vthis single narrow bit less power is r'eable plate I6 to provide access to the interior of quired to perform the operation, and at the same the housing at that point. As will be seen partime the tool may be quickly and easily refaced in ticularly in Fig. l, the plate II nts within a longicase foreign matter or hard spots are encountered tudinal slot vin the housing and is held normally g5 V in the work. in position by transverse pins I 8 which entend In the drawing herewith, Fig. A1 is a side elevathrough the walls of the housing and through said tion of my improved tool. plate I8. To accommodate the use of the .locking Fig. 2 is a similar view partly in central vertical pins I8 the outer wall of the housing is grooved section and indicating the manner in which the as shown at I9. t g 30 tool is anchored in position- 'I'he cutter supporting block I6 is approximately Fig. 3 is a transverse section on the plane 3-3 rectangular in cross section as will be understood 0f Fig- 1- from Fig. 1 and projects through the wall of the Fig. 4 is a Similar Section on the plane 4-4 of housing so that its outer end is flush with the Fig. 1 and looking 1n the direction of the arrows. Outer' surface thereof- Said block has an anti 35 MY boring *P01 LS adapted Wb@ afnchored ,in a friction bearing as shown at 20, which allows the machine tool in the usual-maner. There 1s a said block to be moved muy inward during tapered shank I which is shown in Fig. 4 as adaptthe cutting operation under pressure. ed to engage within an opening 2 in the stock of It wm be understood that, upon assembly of the 40 the machine. It hasaflictional ttherelnsothat tool, the plate |1 is removed and the block le, k40 itis heldin stationary position The tubular body engaged with the sndeway |5, may be moved 3 Ofihe i001 is formed with n axial ,ambe through the open outer end of the slot in the ghzrsgtlvwglgmn 529g; tubular member and against the closed inner end end extending within the shank l, this reduced The plate '1 may the be Secured@ 45 extension bemg adapted to act as a' guide n nthe k Centrally of the supporting block I6 is a cutter stem 1 of the mandrel 2 I. Said cutter ts within a rectangular opening m l dr shape n ad ted said ste 1 is of Gym ical a d ap longitudinally of the cutter block and projects to slide within the recess 6. YThe body 5 of the mandrel is enlarged in diameter as compared therefrom the required distanceto cut the largest 50 with stein 1 and nts within the cyundrical chamdiameter 0f the tapered Orenins which is to be ber l. rt has a. shomder s at one end adapted to formed in the work AS will be Seen from Fir.v 3,

contact with a tubular nut 9 threaded within 'the outer end of the cutter 2l is relieved in one the end of the housing 3 and limiting the movedirection to form a cutting edge in the usual manment of the mandrel in that direction. The opner. This cutter isheldwihinthe block by means 5s Y "tratedf During fthe" operationl ofthe device the .shanlgflzlof the tool is movedgradually. toward of a. setscrewflfwhich-allows its removal and replacement when desired.v 'n y spaced.V rearwardly away from the cutter 2| is an 'outwardextension 23 on the1 housing.

flange or extension serves as a mounting ffor a cutter!! and aesecond cutterl 25..l Thegcutter 2l extends longitudinally througntnenange n and e vhase. forward cuttingend shown rat Nein Fig. l,

workat the proper time. u

which is .adapted.to. engage the end of vthe work atV the properytimeand recess .the end' thereof. The cutting biade 2l pexends radially outward yaway from the housing and has a'forward cutting blade Il, which smooths on the'end of the:y

In the operationl lof thefdevice thew which is indicated generally by tlie broken lines 2l may Y be., rer example; a tooijelntwitmnwmeh a te:

- pered recess is to' beformed. work'ls heldj j at Il will taper/as' shown by the dotted line in in the., lathe in the usual manner and rotated, aboutthe tool by the usualmeans' not hereillusthe worin-.illsme work isrotateed the cutter zi will l engage .on. the inner lace thereof; e 'and cut a recess. indicated iat. in Flg..2 within-.the work.'

rAs the vend/LII Lof :the-mandrel is statilonarythe` movement of thefhousing-v-longitudinaliyagainst the action'off. the `spring il willlmolverthe cutter y. l along the groove gil and, duel' to' t'he {inc1lnation V.of l the i said groove,` ...the y cuttervwill-,be gradually moved'finw'ardlyand therecessln theworkshown '1 Fig. 2. ywir-entire tapered recess unas. been-.eut

- to thexproper.depthfthecutter and y,the cutter 1 25. :will engagefthefiend ofl the work., The-cutter 2'4"f will: cut an .enlarged recess shown f at IQ inl engerandjtneeutter zl wnltnen smoother: the

Y end offtheazwork. and the.51ob.will -befinished.

. The device holding-'.thershankflfwill thenvberetractedy so as to withdrawl-the tool yfrom engage# nientfwith the workland by theusual manipulations. oi' the' machine parts `the work *mayy Abe retively and uniforrnlyvby its engagement inthe e groove yIl of the mandrel Vvto cut'a uniformly tapering recess in the. work.y The tap is held in l positive axial alignment so that no variations or.v lack of uniformity in thektapered recess cut 'byfA the tap Vmay occur. Theencl o! the wort: isrecessed and smoothed en py me cutters u and` :l f

so that all that remains to be done in connection .with the work is4 to thread thegtkperedarea Il.

The advantages er rhisiweonstretion will befoh-` v-ious a.

:It is also to be noted that thisdevice lmay be "adapted'to rotate where V.thefworkis stationary., v 'form of machine is'rnot uncommon and f need not be illustrated.v Also, theinclinationof thefrecess cutma'y( be `a flaring one insteadof- `tapered simply by reversing'the direction oi' in-` lof vclination of the groove i2 in the mandrel. J -I do A` not therefore wish Vto be confined to the'exact details of the` embodiment of the invention herein which follows. v

. Whatis claimed Las new is vdisclosed rfurthenthunis setsiorth in the claim of members of whichjone has tubularportion being )providednwith aneaxiallyf extending, slot having open puter -,end yclosedfinner end, theinner`r ofgsaid members hay# .f. Y lng-av longitudinally 'extending undercut-"alideway i within the saldtubularportion-andinclinedrela- 'j 'f tiver to .the .tool @nays cutter block, slldabie .inf l said slidewayy,andeinterengagedyithj the latter so Vas .to be radiallydisplaced .upon yrelative vxxio've- Awel er me elm descnbegi eompnalglalpalr Y a tubular portion telescopingly receiving "aportion of `the other,

.ment in .either direction''longitudinallyof` saidgg.. .slideway, Sd. block upon assembly of themto'ol l v. ;v movable through'4v slot to ,y theclosed 7 `inner-end ofthelatterwhileengaged. withfsald y f slideway, means securable tosaid tubular member to extend across vsaid slotforthepurpose of. i-'e`f `taining sald block atthelinner. end of said slot, 'means' urging'said members 'A apart, and means limiting movement of said members apart. j y. 

